As I had promised before, hard version of round #383 will be held on Thursday, 22nd December 15:05 UTC. There will be 4 problems, each problem is a harder version of some problem in round #383. The contest is prepared by me. Please don’t copy your codes from previous contest.

I’d like to thank myself as usual, then Mike MikeMirzayanov Mirzayanov for the great Codeforces and Polygon platforms.

P.S. Prepare your fast input / output streams :P

UPD. Note that the Gym is just for training.

TIME CHANGED. Really sorry, but because "Samcode 2016 round #2" will be held tonight (13 to 16 UTC), the gym will be held on Thursday.

UPD. Registration is now open. Note that problems are not sorted according the difficulty.